-
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a
practical regime of right to information for citizens to secure
access to information under the control of public authorities, in
order to promote transparency and accountability in the working of
every public authority, and whereas the attached publication of the
Bureau of Indian Standards is of particular interest to the public,
particularly disadvantaged communities and those engaged in the
pursuit of education and knowledge, the attached public safety
standard is made available to promote the timely dissemination of
this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti
Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता
है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 2109 (1982): Methods of sampling of dolomite, limestoneand
other allied materias [MTD 13: Ores and Raw Materials]
-
IS : 2109 - 1982
Indian Standard
METHODS OF SAMPLING DOLOMITE, LIMESTONE AND OTHER ALLIED
MATERIALS
( First Revision )
First Reprint MARCH 1992
UDC 622.368.24:620.113
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADtYR SHAH ZAFAR
MARC
NEW DELHI 11002
3anuary i 983
-
IS : 2109 - 1982
lndian Standard
METHODS OF SAMPLlNG DOLOMITE, LIMESTONE AND OTHER ALLIED
MATERIALS
( First Revision )
Methods of Sampling Sectional Committee, SMDC 4
Chairman Represenling
DR DAROQA SINQH Indian Agricultural Statistics Research
Institute ( ICAR ), New Delhi
Membm
SERI J. N. GARCI ( Alfernafe to Dr Daroga Singh )
SHRI S. N. AQARWAL Central Statistical Organization, New Delhi
SHRI M. G. BHADE
SHIRT H. L. CHADHA ( Alternate ) Tpta Iron & Steel Co Ltd,
Jamshedpur
DR M. M. CHAHRABORTY The Indian Iron & Steel Co Ltd, Burnpur
SURI A. W. CRAWATHE Government of India, Mint (Ministry of
Finance ) SHRI S. K. DAS Directorate General of Supplies &
Disposals,
New Delhi SARI B. DAS~UPTA ( ALternate)
SHRI B. K. D~RUVA RAO Mineral Exploration Corporation Ltd,
Nagpur SHRI D. B. GHOST Geological Survey of India, Calcutta SIIRI
C. N. HARMAN Ferro Alloys Corporation Ltd, Shreeramnagar
SHRI A. SAN~AMESWARA RAO ( Alfernatc ) SHRI S. S. HONAVAR ltalab
Private Ltd, Bombay
SHRI J. P. PATEL ( Alternate) SERI P. K. KRISHNAMOORTHY Ministry
of Railways
SHRI R. K. DASQUPTA ( A~f6rnat6 ) Saar K. S. MAHAPATRA
SHRI U. N. SARKAR ( Ahfnatc) Indian Bureau of Mines, Nagpur
SHRI A. K. MITRA Mitra S. K. Private Ltd, Calcutta SHRI M. N.
MITRA ( A~fernate )
SHRI B. MUKHERJEE Steel Authority of India, Bhitai SHRI P. K.
PAIN National Test House, Calcutta Sarrr R. J. PA~DEY Indian
Statistical Institute, Calcutta SHRI B. R. PATEL Therapeutics
Chemical Research Corporation,
SEMI M. V, VAIDYA ( A&mols ) Bombay
( Continued on page 2 )
@ copytigbt 1983
BUREAU OF INDIAN STANDARDS This publication is protected under
the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole
or in part by any means except with written permission of the
publisher shall be deemed to be an infringement of copyright under
the said Act.
-
ISr2109-1982
( Continuedfrom pugs 1 )
Members RepesfnLing
SHRI T. R. PUB1 Arm &
Statistical Organization ( Ministry of efence), New Delhi
SH~I R. D. AQRAWAL ( Altanatc ) DR J. RAJARAX Esren & Co,
Bangalore
SERI V. SHANXAR NARAYAI ( AItcrnafe I )
SERI K. N. GVBU~AJAOHAB ( Altsrnafs II )
DR M. RANQA RAO Steel Authority of India Ltd, Ranchi (R &
D
SHW A. K. SATSANC+I ( Ahmatr ) Organization )
Ds B. R. L. Row SERI G. L. JETHWANI ( .&rnat6)
Hindustan Zinc Ltd, Udaipur
SHRI P. M. SENQUPTA Directorate General of Inspection ( Ministry
of Defeoce )
SARI T. K. BHATTACHARJEEI ( A&rnotc )
SHRI R. C. VZDYARTHI SHHI S. 0. JEA ( Ahnut )
Sa~r Y. K. BHAT, Director ( Stat )
Bharat Aluminium Co Ltd, New Delhi
Director General, IS1 ( Ex-ojiciu Member )
SARI N. SAN~AR Deputy Director ( Stat ), ISI’
Subcommittee on Sampling of Ores, SMDC 4 : 3
Members
SHRI S. K. AQRAWAL
DR S. M. REQE ( Ahrnd6 ) SH~I 13. N. BHABQAVA
Sanr U. N. SARXAR ( &6mst6) SERI S. K. DI~SHIT
SHRI A. GANQULY ( A~&rna#6 ) DIBECTOR OF INDUSTRIES &
MXNE~ SHRI N. B. GUDE SHRI C. N. HABMAN
SHRI A. SANQAMESWARA RAO
SHRI 8 %I?~~~AR SH&~. P. PATEL ( Ahnate I) SHBI J. C. DEY
(Alternut II )
DR SURESE M. JAWKHINDIKAB SEIRI D. LAHIRI SHRI G. P. MATHUB SHRI
A. K. MITRA
SERI M. N. MITRA (&mats)
Min~$D~,hvietals Trading Corporation Ltd, e
Indian Bureau of Mines, Nagpur
Indian Iron & Steel Co Ltd, Burnpur
Government of Goa, Daman and Dieu, Panjim Chowgule & Co Pvt
Ltd, Mormugao ( Goa) Ferro Alloys Corporation Ltd,
Shreeramnagar
Italab Private Ltd, Bombay
S. G. S. India Private Ltd, Bombay Geological Survey of India,
Calcutta National.Metallurgical Laboratory, Jamshedpur Mitra S. K.
Private Ltd, Calcutta
( Confintud OII @g6 16 )
-
ISt2109-1982
Indian Standard METHODS OF SAMPLING DOLOMITE,
LIMESTONE AND OTHER ALLIED MATERIALS
( First Revision)
0. FOREWORD
0.1 This Indian Standard ( First Revision ) was adopted by the
Indian Standards Institution on 26.July 1982, after the draft
finalized by the Methods of Sampling Sectional Committee had been
approved by the Structural and Metals Division Council.
0.2 This standard was originally issued in 1962. The experience
gained in. the implementation of this standard during the following
years led to the present revision. In this revision the
classification of dolomite, limestone and other allied materials
has been restricted to two categories, namely, run of mine, and
crushed and screened. Further the tables giving the number and mass
of increments as well as unit samples have been simplified. The
procedure of ‘point sampling, not found to be representa- tive in a
number of situations, has been eliminated in this revision.
Increment reduction method of sample division has been introduce,d
and also various stages of reduction of gross sample leading to
laboratory sample have been streamlined.
0.3 Iti the formulation of this standard, due consideration has
been given to international standards and practices prevailing in
different countries. For this purpose guidance has been obtained
from the following standards issued by the International
Organizations for Standardization:
IS0 3081- 1973 Iron ores - Increment samplingl- Manual method,
and
IS0 3083 - 1973 Iron ores - Preparation of samples
0.4 For the determination of size distribution of dolomite,
sieves conform- ing to IS : 460 ( Parts I & II) - 1978* shall
be used. When such sieves are not available other equivalent
standard sieves as judged by the aperture may be used.
*Specification for test sieves: Part I Wire cloth teat sieves (
second reabion ). Part II Perforated plate test sieves ( recond
revision ).
-
IS:2199- 1982
0.5 In reporting the test result of analysis, if the final
value, observed or calculated, J to be rounded off, it shall be
done in accordance with IS : 2-1960;.
1. SCOPE
1.1 This standard lays down the procedure to be followed in
collecting and preparing samples from a lot in order to determine
size distribution, moisture content and chemical analysis of
dolomite, limestone and other allied materials in the lot. It gives
detailed procedures for sampling’from stock piles, loaded wagons,
trucks, conveyors and shipholds.
1.1.1 This standard also includes a method for estimating and
reporting the quality characteristics of dolomite, limestone and
other allied materials supplied in bulk.
2. TERMINOLOGY
2.0 The word ‘dolomite ’ in this standard shall mean limestone
and other allied materials also for brevity. For the purpose of
this standard, the following definitions shall apply.
2.1 Run of Mine -Dolomite consisting of all sizes up to 200
mm.
2.2 Crushed and Screened - Dolomite of sizes not more than 50 mm
obtained after crushing and screening.
2.3 Consignment - The quantity of dolomite delivered at one
time.
2.4 Lot - The quantity of dolomite indicated to be of the same
category and offered for inspection at &ne time. A lot may
consist of whole or a part of the quantity ordered for.
2.5 Sub-lot - The quantity of dolomite in each of the portions
into which a lot is divided for the purpose of sampling.
2.6 Increment -The quantity of dolomite obtained by a sampling
device at one time from a lot or sub-lot.
2.7 Unit Sample -The quantity of dolomite collected at one point
in sectional sampling or at one time from the conveyor.
2.8 Gross Sample - Sample as collected from a sub-lot, that is,
the quantity of material consisting of one or several increments or
unit samples taken from a sub-lot.
2.9 Size Sample - The sample taken for the determination of the
size distribution of the lot or sub-lot.
*Rules for rounding off numerical values ( revised ).
E
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IS : 2189 - 1982
2.10 Mpistutie Sample- The sample drawn from a sub-lot
exclusively for the use of the moisture determination.
2.11 Laboratory Sample - The quantity of material obtained by
reducing a gross sample following a specitied procedure, intended
for laboratory testing.
2.12 Composite Sample (for the lot ) - The quantity of material
obtained by mixing together equal or proportionate quantities of
material from each of the laboratory sample representing sub-lots
into which a lot has been divided.
3. SAMPLING FROM STOCK PILE
3.0 The stock piles differ greatly in sizes, particularly in
height and hence the collection of samples from stationary stock
piles becomes difficult and costly. Sampling of stock piles may be
done by anyone of the methods described in 3.1 and 3.2, preferably
by the former method. For the procedures given in 3.2, the top
surface of the stock pile to be sampled shall be flat and even over
the entire stock’pile as far as possible.
3.1 Sampling During Formation or Dismantling of Stock Piles
3.1.1 Quantity of dolomite to be loaded into or unloaded from a
stock pile shall be considered as consisting of a number of
sub-lots of approxi- mately equal mass as specified in Table 1. If
the loading or unloading is done shiftwise, each shift may be
conveniently taken as representing one or more sub-lots depending
on the quantity loaded or unloaded.
TABLE 1 NUMBER OF SUB-LOTS
(Clauses 3.1.1,3.2.1,4.1,5.1ond6.1)
MASS Or THE LOT NUMBER OB SUB-LOTS ( IN TONNES )
(1) (2) up to 1 000 2
1 001 to 3 000 3
3 001 to 6 000 4 6 001 and above 5
3.1.1.1 From the quantity of dolomite constituting a sub-lot,
the number of increments specified in Table 2, depending on the
category of dolomite, shall be collected at regular intervals
spaced over the whole period of loading or unloading. The
increments, each of mass specified in Table 2, shall be collected
with the help of suitable scoop ( Fig. 1 ) or baskets of equivalent
capacity.
NOTE -While sampling run of mine dolomite, if a lump of size,
over 200 mm is encountered at any point, the lump shall be picked
up as it is (without breaking into pieces ), to be accounted for in
the size determination as given under 7.4.1 and in the reduction of
gross sample as given under 8.2.
5
-
1s : 2109 - 1982
TABLE 2 MASS OF THE INCREMENTS AND UNIT SAMPLES
(Clauses 3.1.1.1, 3.2.1.1, 3.2.1.2, 4.2, 4.3, 5.1 d6.2)
SL MO. IN~[LE~I~NT~ RUN OP MINE CltUt313ED AND &X&ED
(1) (2) (3) (4)
i) Increment mass (kg) 4 2
ii) Number of increments 100 80
iii) Mass of gross samples (kg) 400 160
iv) Number of unit samples 10 4
v) Mass of unit sample (kg) 40 40
3.1.2 Gross Samples - All the increments collected from the same
sub-lot shall be combined together to constitute a gross
sample.
3.2 Sampling from Stationary Stock pile
3,2.1 Sub-lots -The quantity of dolomite in the stock pile shall
be approximately estimated and shall be divided into a number of
sub-lots of approximately equal mass as per Table 1. The dolomite
surface in the sub.lot shall be levelled, before sampling. Each
sub-lot shall be sampled either by sectioual sampling (see 3.2.1.1)
or by trench sampling (see 3.2.1.2 ).
3.2.1.1 Sectional sampling -The number of unit samples to be
collected from a sub-lot shall be as given in Table 2. For
collecting those unit samples, an equal number of points shall be
located on the central longitudinal line of the dolomite surface in
the stock piles.
On the surface of each of the stock pile on which a point has
been located a circle of diameter three times the maximum particle
size of dolo- mite shall be marked at the selected point and over
the area of the circle the entire section of the dolomite, from top
to bottom shall be collected in stages. This can be done by
reaching initially up to a depth of 50 cm and then covering the
hole so formed, by a plate for removing the matering lying on the
sides of the hole. After removing the plate, further depth can be
reached in the same manner. This procedure is repeated till the
bottom of the stock pile is reached.
3.2.1.2 Trench sampling - The gross samples shall be made up of
the number of increments as specified in Table 2. These increments
shall be taken from the- stock pile in the following manner:
The number of increments shall be equally distributed over the
entire stock pile and along a randomly chosen line on the surface,
a trench shall be cut right down to the ground level leaving a
space of 30 cm in width to provide for walking space. From the
trenches so cut, the requisite number of increments
6
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Is,2109-1982
shall be collected with the help of a suitable sampling scoop
(see Fig. 1 ) at various points spread over the two exposed sides
of the trenches. In, case of larger stock piles;in addition to the
trenches so formed, the sides of the stock piles may also be opened
to expose the material at place where the trench does not expose
the material inside.
3.2.2 The gross sample for each sub-lot shall be formed by
combining all the unit samples or increments collected from stock
piles.
WOODEN tiANDLE
NOMINAL DIMENSIOBB OB THE SAMPLING SCOOP IN mm
CAPAOITY OP r-------- _~_--__-------~
THE SCOOP A B c D E F G
(1) (2) (3) (4) (5) (6) (7) (6, 8 kg
( Lump and sized ) 200 200 100 175 115 440 40
4 kg ( Calibrated and 175 120 100 100 65 350 30
fines )
Fxo. 1 SAMPLING SCOOP
4. SAMPLING FROM WAGONS AND TRUCKS
4.1 Representative samples of dolomite may be collected either
during loading-or unloading of wagons or trucks, that b, when the
material is in
-
IS:2109- 1982
motion or from loaded wagons or trucks. As far as possible,
sampling during motion is to be preferred.
4.1 Sub-lots - For the purpose of sampling, all the wagons or
trucks in the lot shall be divided into a number of sub-lots of
approximately equal mass as specified in Table 1. If loading and
unloading operations are carried out shiftwise, it will be
convenient to treat the material loaded or unloaded in a shift as
one or more sub-lots depending on the mass of the material.
4.2 Sampling During Loading or Unloading - For sampling of
dolomite during the course of loading or unloading, the number of
incre- ments to be collected from each sub-lot and the mass of the
increment shall be as given in Table 2 depending on the category of
the material. In case of wagons, at least 25 percmt of the total
number of wagons in a sub-lot, subject to a minimum of 5 shall be
selected at random and the required number of increments shall be
evenly distributed at equal inter- vals, over the selected wagons,
In case the sub-lot consists of 5 or less number of wagons, all of
them shall be subjected to sampling and the number of increments
shall be equally distributed. In the case of trucks, at least 50
percent of the trucks in a sub-lot subject to a minimum of 10 shall
be selected at random and the required number of increments shall
be evenly distributed. In case the sub-lot size is less than lo-
trucks, all of them shall be subjected to sampling. The increments
may be collected with the help of sampling scoop ( Fig. 1 ) or
suitable basket of equivalent capacity. When the dolomite is
received from a single source it is sufficient to sample 25 percent
of the trucks subject to a minimum of five.
4.3 Sectional Sampling -- For the purpose of sampling from
loaded wagons, the method of sectional sampling shall be adopted.
The number of unit samples to be collected from each sub-lot shall
be in accordance Table 2. For collecting these unit samples, an
equal number of points shall be located on the central and
longitudinal lines of the dolomite surface of all the wagons in the
lot. At each point, a unit sample shall oe collected as indicated
in 3.2.1.1. Sectional sampling from trucks is to be avoided as far
as possible and sampling has to be carried out only luring the
loading or unloading of trucks.
:i n SAMPLING DURING LOADING/UNLOADING OF SHIPS
5.1 The quantity of dolomite in .a lot shall be divided into a
number of sub-lots of approximately equal mass as specified in
Table 1. Sampling has to be carried out only when the material is
loaded into or unloaded from a shiphold. The number of increments
as given in Table 2 shall be &taken at regular intervals of
time.
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fS t 2109 - 1982
6. SAMPLING FROM CONVEYORS
6.1 Sub-lots - For the purpose of sampling a, lot, while it is
being dis- charged over a conveyor, shall be divided into a number
of sub-lots of approximately equal mass as specified in Table 1.
This can be done by dividing the total duration of movement of
dolomite into a number of equal intervals corresponding. to the
number of sub-lots, keeping also in view the rate of discharge.
The material moved in each of such intervals will form a
sub-lot. A representative gross sample shall be drawn from each of
the sub-lots and shall be kept separately. Thus there will be as
many gross samples as the number of sub-lots into which the lot has
been divided.
6.2 The number of increments to be taken from a sub-lot is given
in Table 2 and depends on the category of dolomite. The number
shall be evenly distributed over the sub-lot. The increment shall
be drawn with the help of a suitable sampling scoop (see Fig. 1) at
regular intervals.
6.3 Taking Increments at Discharge Points - When the material is
in motion; the most reliable means of taking such increments is to
sample at a point where it discharges from the belt. The best
possible increment is one which cuts across entirely the falling
stream of the material by means of a suitable receptacle passed
from one side of a stream to the other without allowing the
material to overflow the receptacle. The stream should be sampled
systematically by taking material from all portions.
6.4 Sampling by Stopped Belt Method - If it is practicable to
stop the conveyor belt periodically, larger quantity of dolomite
constituting unit sample may be drawn from the belt so as to avoid
frequent stoppage of the belt and interruption of the flow of
material. The mass of each unit sample shall be not less than 40 kg
and it shall be collected from the full width and thickness of
stream. The number of unit samples as given in Table 2 shall be
equally spread over the entire sub-lot.
7. DETERMINATION OF SIZE DISTRIBUTION
7.1 The size distribution of dolomite in a lot shall normally be
estimated as given below:
a) Over 200 mm,
b) Over 150 mm and up to 200 mm,
c) Over 50 mm and up to 150 mm,
d) Over 10 mm and up to 50 mm,
e) Over 1 mm and up to 10 mm, and
f ) 1 mm and below.
9
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IS t 2109 - 1982
If necessary, dolomite of other sizes may also be estimated.
NOTED - In the determination of size distribution sieves of
suitable sizes. as
specified in IS : 460 ( Part II )-1978* shall be used wherever
possible.
7.2 Grooo Samples Constituted by Aggregating Unit Samples - Each
gross sample shall be screened successively through selected sieves
(see 7.1) and the quantity retained on each of the sieves, as also
that passing through the smallest sieve, shall be weighed
separately and recorded.
7.2.1 Size distribution for the lot shall be estimated as
follows:
=1 + as + a) Over 200 mm, percent =----- ............ ml -I- m2
+
x 100 ...........
b) Over 150 mm, and 61 + b* + . . . . . . . . . . . . x
up to 200 mm, percent = ml -I- ma f.. ..T. 1oo
c) Over 50 mm, and Cl + cg + . , . . . . .
up to 150 mm, percent -ml + me +.. . . . . . . . . . x 100
d) Over 10 mm, and 4 + ds’f a-- .- . . . . . . . . . x 1o()
up to 50 mm, percent ml + ms + . . . . . . . . ,...
e) Over 1 mm, and fl+Q t... x 100
up to 10 mm, percent -ml + ms + . . . . . . . . . . . .
f) 1 mm and below, _fi +fB + . . . . . . . . . . . . x 100
percent ml + m8+ . . . . . . . . . . .
where
ml, ms . . . . . . . . . . . . are the masses of the different
gross samples,
a13 a1 ,.., . . . . . . . . . are the corresponding masses of
dolomite of size exceeding 200 mm,
h, ba . . , . . . . . . . . . are the corresponding masses of
over 150 mm, and up to 200 mm,
Cl, C¶ . . . . . . . . . . . . are the corresponding masses of
over 50 mm, and up to 150 mm,
4, 4 . . . . . . . , . . are the corresponding masses of over 10
mm, and up to 50 mm,
dolomite of size
dolomite of size
dolomite of size
81, a . . . . . . . . . . . . are the corresponding masses of
dolomite of size over 1 mm and up to 10 mm, and
fl,fS ,....... . . . . are the correbponding masses of dolomite
of size 1 mm and below.
NOTE - Percentage of material of any other de&red sire shall
be calculated on similar lines.
*Specification for test sieves: Part II Perforated plate test
sieves ( second recision).
10
-
IS : 2109 - 1982
7.3 Gross Samples Constituted by Aggregating Increments - Where
the gross samples do not contain any lump over 200 mm the procedure
detailed in 7.2 and 7.2.1 shall be followed for estimating the size
distri- bution in the lot, the perceutage of material over 200 mm
being nil.
7.4 Where the gross samples contain some lumps over 200 mm, the
por- tion of the gross samples excluding such lumps shall be
treated as in 7.2.
7.4.1
a)
b)
4
4
e)
f >
The size distribution for the lot shall be estimated as
follows:
Over 200 mm, percent 0 ( 4n ) + ml’ +4i; + .......... X 100
Over 150 mm, and 61 + 6s + = ..i ..,........... *... x loo
up to 200 mm, percent ( 4n ) + ml’ + ms’ + . . . . . . . . .
Over 50 mm, and Cl -I- cs + = ..,...; . . . . . . . . . .
..I.
up to 150 mm, percent ( 4n ) + ml’ + ms + x loo
. . . . . . . . .
Over 10 mm, and dr + ds_+ . . . . . . . . . . . . . . . . . x
1oo
up to 50 mm, percent = m ml’ + ms’ + ._ . . . . . .
el + es + Over 1 mm, and = -
. . . . . . . . . . . . . . . . ( 4f~ ) + ml’ + ms’ + . . . . .
. . . .
x 100 up to 10 mm, percent
1 mm, and below, percent
= fr 3 .fz. + . . . . . . . . . . . . . . . . . . . . . ( 4n ) +
ml’ + ms’ + . . . . . . . . .
x loo
where
ml!, ms’ .., . . . are the masses ( in kg ) of the different
gross samples excluding lumps over 200 mm,
n is the total number of lumps over 200 mm in all the gross
samples, and
bl, b2 . . . . . . . . . . cl, c2 . . . . . . . . . . dl, d, . .
. . . . . are as defined in 7.2.
NOTE -hhs of each lump is taken to be equivalent to one
increment, that is, 4 kg.
8. REDUCTION OF A GROSS SAMPLE
8.1 Moisture Sample - Each of the gross samples shall be sent
first for size determination and only after that the sample
preparation shall be carried out. For moisture determination,
moisture sample of 20 to 25 kg shall be taken from each gross
sample in not less than 5 increments after crushing the material to
-10 mm size by mechanical or manual means. From this 20 to 25 kg
material, two or more samples of 1 kg each shall be drawn for
moisture determination.
11
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t6 I 2109 - 1982
NOTE - If needed, separate moisture samples may be drawn from
the sub-lot by any other procedure, as agreed to between the
purchaser and the supplier.
8.2 Preparation of Samples for Chemical Analysis - Dolomite in
each gross sample shall be first crushed in a jaw crusher, roll
crusher or manually using a hammer or pounder and a suitable steel
plate, till the material in gross sample is of -10 mm size.
Duplicate moisture samples of 1 kg each may be collected at this
stage, if not already done. The rest of the material shall be mixed
well and reduced, to 20 kg which shall then be further p_rocessed
in stages as detailed in Fig, 2, to prepare the laboratory samples
for chemical analysis. For reduction at various stages one of the
methods detailed in 8.2.1 to 8.2.3 shall be followed. The mass of
the each laboratory sample shall be at least 200 g.
NOTE - The lumps obtained while collecting the increments ( see
3.1.1.1 ) shall be crushed separately and one scoopful for each
lump ( approximately 4 kg for run of mine ore ) shall be taken
along with the’materials of other sizea in the gross sample for
red.uction as detailed in 8.2.
GROSS SAMPLE
SIZE DETEitMINATION
CRUSHED’TO -10 mm
MIXI.NG AN; REDUCTION 4
20 kg of REDUC!ED SAMPE
i
TWO MOlSTURt SAMPLES ( 1 kg each )
CRUSHEDTOPASSTHROUGH- 4.75 mm IS SI.EVE
MIXING AND RtDUCTION TO 10 kg
CRUSHED TO &SS THROUGH 1.70 mm IS SIEVE
MIXING AND RjEDUCTlON TO 2’5 kg
CRUSHED TO FtASS THROUGH 550 micron IS SIEVE
MIXING AND RtDUCTION TO 600 Q J
PULVERIZED TO PASS THROUGH 150 micron IS SIEVE
LABORATORY&LE FOR CHEMICAL ANALYSIS
FIG. 2 STAGES OF RLDUCING A GROSS SAMPLE .? I ~5 . ,, . .
12 1‘ L
\$ t
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fS I 2109 - 1982
8.2.1 Reduction b9 Rt#le Divider - After each crushing,‘the
material shall he well mixed and poured into the riffle. This
process shall be repeated using rifles of different sizes according
to the size of the crushed material.
8.2.2 Coning and Quartering Method - In this method the crushed
dolo- mite shall be well mixed and then scooped into a cone-shaped
pile. Care shall be taken to drop each scoopful over the same spot
to ensure even distribution of lumps and fines on all sides of the
cone.
After the cone is formed it shall be flattened by pressing. the
top of the cone with the smooth surface of the scoop. Then, it is
cut into quarters by two lines which intersect at right angle at
the centre of the base of the cone. The bulk of the sample is
reduced to half by rejecting any two diagonally opposite
quarters.
8.2.3 Increment Reduction Method ( after being crushed to
- The division of the gross sample
method ( see Fig. 3 ) -10 mm ) by the manual increment
division
shall dure.
be carried out according to the following proce- It is advisable
to have at least 20 increments under this method.
The size of the increment shall be as specified in Table 3.
a>
b)
Spread the crushed sample on a smooth, flat and non-moisture
absorbing plate, into a uniform flat rectangle of dimensions
axbmm.
Divide the rectangle into five equal parts lengthwise and four
equal parts breadthwise ( for 20 increments ) as given in Fig.
3.
FIG.~ MANUAL INCREMENT DIVISION METHOD
13
-
IS t ilO - 1992
c) From each of the 20 parts so obtained, equal quantities, not
less than that specified in Table 3, shall be collected with the
help of a suitable scoop and combined together to form the reduced
sample.
In the above procedure the scoop shall be inserted to the bottom
of the sample layer and if necessary a bumper plate may be inserted
in front of the scoop to facilitate the operation.
TABLE 3 SIZE OF INCREMENTS IN MANUAL INCREMENT DXVISION
METHOD
SIZE OF MATEWAL
( Clause 8.2.3 )
TEICKNESS OB LAYER QUANTITY TO BE OBTAINED AT ONE TIME FROM EACB
PART
(1) (2) (3)
mm mm 6
10 30 to 40 250 4.75 25 to 35 150
1.70 15 to 25 40
0.85 10 to 20 25 o-15 5 to 10 5
9. NUMBER OF TESTS
9.1 Moisture Determination - All the moisture samples
representing different sub-lots in a lot shall be tested
individually for moisture content. If needed, moisture
determination shall be carried out in duplicate for each gross
sample, To avoid change in moisture content, the moisture
determination shall be done a! quickly as possible.
9.2 Laboratory Samples for Chemical Analysis - All the
laboratory samples shall be tested individually for important
characteristics. For the remaining characteristics, a composite
sample prepared by mixing equal or proportionate quantities of
dolomite from each of the laboratory samples shall be analysed.
Unless otherwise agreed to between the purchaser and the supplier,
the following schedule of testing should be followed:
1 ’ I
Individual laboratory samples I
A composite sample to be to be analysed for: analysed for:
a) Calcium oxide b) Silica c) Loss on ignition
14
Alumina Magnesium oxide Ferric oxide Carbon dioxide
-
ZS : 2109 - 1982
10. REPORTING
IO.1 Reporting of Moisture Content - The result .obtained from
ith sub-lot shall be denoted by ‘ xi ‘, In case duplicate test
results are obtained for ith sub-lot, average of these two results
shall be denoted by ~1. The overall moisture content of dolomite in
the lot shall be calculated by the following formula:
Average moisture content = Xmr x xi
I: ni
where mi, is the mass of the ith sub-lot and symbol 2; stands
for summation over all i’s.
10.2 Chemical Analysis
10.2.1 For those characteristics, where composite samples have
been tested, only one test result will be available and that result
shall be repor- ted as the value of that characteristic for the lot
sampled.
10.2.2 When two laboratory samples have been analysed
individually from a lot, the average of the two available test
results shall be reported as the value of the characteristic for
the lot sampled. The individual test results shall also be reported
to give an indication of the range of variation in quality.
10.2.3 When three or more laboratory samples have been analysed
individually from a lot the following procedure shall be followed
to assess the average quality andits limits of variation.
Let x1, .x2, . . . . . . . . . . . . . . . ..xn be the results
of analysing II laboratory samples for a particular
characteristic.
Calculate,
Average(f)=Xr+X*f *-.+‘a, and n
Range (R) = the difference between the maximum and minimum
values.
The limits of variation in the average kvel of the
characteristic in the lot shall be reported as (Z & hR ), where
h is a factor, the value of which depends upon the number of
laboratory samples analysed. The appropriate value of the factor h
is given below:
Number of Laboratory Valirc of Factor h Samples Analyscd
3 l-30
4 0.72
5 o-51
15
-
tS : 2109 - 1982
( Confinusdfrom page 2 )
Members &Qresenting
SARI M. M. MOUDQILL SHRI B. MUPHERJEE
Indian Aluminium Co Ltd, Calcutta
SIIRI PIJUSH KANTI BANE~JEE Bhilai Ispat Ltd, Bhilai
( Alternate ) SHRI R. C. PALHAN
SHRI KARAM CHAND (Alternate) Export Inspection Council of India,
Calcutta
SFIRI B. R. PATEL Therapeutics Chemical Research
CorDoration,
SHRI M. V. VAIDYA ( Alternate ) DR J. RAJARAM
Bombay
Snn~ K. N. GURURAJAOHAR Essen & Co, Bangalore
( Alternate ) SHRI M. R. ROY Inspection & Testing Co ( India
) Pvt Ltd,
Calcutta SHRI G. V. SUBRAMANYA
SHRI V. P. ROY ( Alternate ) SHRI G. R. TALAULIXAR
National Mineral Development Corporation Ltd, Hyderabad
Goa Mineral Ore Exporters’ Association, Panjim (Goa)
16
-
BUREAU DF INDIAN STANDARDS
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Common to all Offices)
Regional Offices: Telephone
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I
331 0’1 31 NEW DELHI 110002 331 1375
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inspection Offices ( With Sale Point ):
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5 36 27 3 31 77
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63471 6 98 32
i t; x: 3: 6 23 05
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2 51 71
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l Sajes Office in Calcutta is at 5 Chowringhee Approach, p. 0.
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66 28 Bombay 400007
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Square, 22 36 71 Bangalore 550002
Reprography Unit, BIS, New Delhi, India
s: (Reaffirmed 2003)